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Engineering hard ferrite composites by combining nanostructuring and Al3+ Substitution: From nano to dense bulk magnetsстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Maltoni Pierfrancesco, Barucca Gianni, Rutkowski Bogdan, Ivanov Sergey A., Yaacoub Nader, Mikheenkova Anastasiia, Ek Gustav, Eriksson Mirva, Almqvist Bjarne, Vasilakaki Marianna, Varvaro Gaspare, Sarkar Tapati, De Toro Jos´e A., Trohidou Kalliopi, Peddisi Davide, Mathieu Roland
- Журнал: Acta Materialia
- Том: 282
- Год издания: 2025
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Первая страница: 120491-1
- Последняя страница: 120491-14
- Аннотация: We have investigated the bottom-up sol-gel synthesis of nanocomposite powders comprising two magneticphases (hexagonal Sr ferrite and spinel Co ferrite) in order to outline a strategy to obtain permanent magnetswith large coercivities via low-cost and scalable syntheses. The correlation between morphological, structuraland macroscopic magnetic properties of Al-substituted SrFe12O19 and SrFe12O19/CoFe2O4 nanocomposites wasanalyzed in detail. The hysteretic behavior can be tuned by cation substitution and/or modulation of the superexchangecoupling at the interface of the constituting phases. The magnetic data, supported by Monte Carlosimulations, indicates enhanced magnetic coupling within the composite: this observation underscores the significanceof soft crystallite size and epitaxial growth quality at the interface as key factors influencing superexchangecoupling strength, ranging from fully coupled to essentially decoupled composites. Bulk magnetswith high density were manufactured by compacting these nanostructured phases using spark plasma sintering,without an applied magnetic field. Consolidation of powders significantly impacted magnetic properties, byincreasing remanent magnetization and decreasing coercivity due to enhanced super-exchange coupling. Thepresence of two phases hindered reciprocal growth, influencing coercivity differently in various compositions.Overall, the compaction enhanced magnet performance through improved particle alignment and superexchangecoupling, offering the potential for optimized magnet design.
- Добавил в систему: Иванов Сергей Александрович
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